Grinding tool



W. V. HOUCK GRINDING TOOL March 13, 1928.

2 Sheets-heet Filed June 20. 1925 m fl mun- March 13; 1928. 1,662,385

- W. V. HOUCK GRINDING TOOL Filed June 20, 1925 2 Sheets-Sheet 2 477a rrms: v

Patented Mar. 13, 1928.

UNITED STATES WALTER V. HOUCK, OF SNYDER, NEW YORK.

GRINDING TOOL.

Application filed June 20, 1925. Serial No. 38,579.

My invention relates in general to grinding tools, and more particularly to a tool by the use of which cylinders may be ground or polished.

6 It is well known to those skilled in the art that cylinder grinding tools of the present day, the abrading or polishing stones are adjusted by being rotated about the pivotal point of the links which carry the stones, so

that. the stones will not contact over their entire width throughout their travel. Furthermore, when such devices are used upon cylinders having longitudinal score, the longitudinally arranged stones thereof engage 1 with the score and produce work which is not truly round.

The general objects of my invention have been to produce a device which shall overcome the above disadvantages by providing a tool having abrading stones, movable radially from the center of the tool, whereby adjustment of the tool to various sized workpieces will not materially afiect the relation of the working face of the stones with the surface of the work-piece.

Moreover, the abrasive stones of my tool are spirally arranged, and, therefore. produce uniform cylindrical work even though longitudinal scores exist in the work-piece.

Other objects have been to provide a device which may be easily and quickly adjusted to various sizes. and one which shall remain truly cylindrical at both ends during operation.

Furthermore, my device. is simple and durable in construction and is of such a design that it will not easily get out of order.

The above objects and advantages have been accomplished by the device in the ac- 40 companying drawings, of which:

Fig. 1 is an exterior view of my device. Fig. 2 is a plan view of the head of the device with the cover removed.

Fig. 3 is a transverse, sectional view taken 45 on line 33 of Fig. 1.

Fig. 4 is a longitudinal, sectional elevation of the device.

Fig. 5 is a transverse, sectional elevation taken on line 5-5 of Fig. 4.

Fig. 6 is a similar elevation taken on line 6-6 of Fig. 4.

Fig. 7 is a fragmentary plan view of the device. 7

Fig. 8 is a transverse, sectional view simi- 55 lar to that shown in Fig. 3 but of a modified form.

The device comprises a shaft 10 which extends substantially the full length of the device, and near the top of which is rotatably mounted a head 11. The head is provided with a central recess 12, in which is disposed a spiral spring 13. This spring has one of its ends 14 disposed in a slot 15 formed in the head 11. The other end 16 of the spring is mounted in a slot 17 formed in the shaft 10. The head may thus be rotated about the shaft 10 to produce a relative rotative tendency between the shaft and head as a result of the tension produced upon the spring 13. The shaft and head are locked in position when the spring is under tension by means of a notched wheel 20, rigidly secured to the. shaft and disposed above the head 11, and a detent lever 21 which is pivotally attached to the upper surface of the head 11 by means of a. pivot screw 22. The inner end of this lever is provided with a detent 23, engageable with the notches 24 of the notched wheel 20. The outer end of the lever 21 is provided with an upstanding arm 25 by which the lever may be operated. A flat spring 26, carried by a post 27, secured to the head 11. serves to keep the detent lever in the position shown in Fig. 2.

Three abrasive stones 30 are preferably employed in my device, each one arranged at an angle to the other of substantially 120. Each stone is carried by a tray 31, which is provided with a suitable gib 32 and gib screws 33, whereby the stone may be securely clamped in the tray. Each tray is provided near each of its ends with a bearing yoke 35. These bearing yokes are arranged about the shaft 10, and each slidably engages a bearing block 36, rotatably mounted upon the shaft, as clearly shown in Fig. 5. The bearing blocks and yokes are arranged so that the group at each end will be disposed longitudinally on the shaft and preferably adjacent each other, as clearly shown in the drawings and particularly Fig. 4.

Each of the trays 31 has a pivotal lug 37 at its upper end and a lug 38 at the lower end. The lugs 37 are connected by means of pivot screws 39 to links 40 which serve to drive the device. The inner end of the links 40 are pivotally connected" by means of screws 41 to lugs 42 carried by the under side of the head 11. The lugs 38 at the bottom of each of the trays 31 are connected to links 45 b means of pivotal screws 46. The inner en of these links are connected by means of pivot screws 47 to points equidistant upon a bearing hub 48. This bearing hub is rotatably mounted upon the lower end of the shaft 10.

Arranged near the center of each of the trays 31 is an adjusting arm 50. These adjusting arms are preferably integral with the trays and extend. like the bearing yokes 35, at right angles to the trays and shaft 10. Each adjusting arm is formed with a recess 51 which is disposed about the shaft 10. Each arm is provided at one side with an adjusting rack 52. Each of the racks engage gear teeth 53 formed on the shaft 10. By a relative rotation between the head 11 and shaft 10, the adjusting arms will move the trays away from or toward the center of the shaft in such a manner that a tangential line drawn through the curved working surface of each of the stones will always be at right angles to a radial line drawn through the center of the shaft.

The head 11 is preferably provided with a reduced peripheral portion 55 over which a cover 56 is fitted. The peripheral portion is provided preferably with two oppositely arranged pins 57, which engage with L-shaped slots (not shown) formed in the cover 56, thus forming the well known bayonet joint. The arm 25 of the detent lever 21 extends upwardly through the cover 56 and a slot 58 is formed in the cover for the arm.

The upper end of the shaft 10 is provided with a driving pin 59 with which a driving head 60 is engageable. A driving stud 61 is preferably carried by the head and is of such a size as to be conveniently grasped by an electric drill or other suitable device for rotating the tool. The cover 56 is preferably provided with slots 62 which are arranged to pass over the drive pin 59 when it is desired to remove the cover. The drive 'head 60 is so arranged that by giving it a backward rotation of about 90, the drive pin 59 will engage with slots 63 formed in the drive head, whereby the same may be removed from the shaft.

When it is desired to use my tool to grind or true up a cylinder, the detent lever 21 is disengaged from the notched wheel 20, and the stone trays 31 are forced inwardly by the hand of the operator against the tension of the spiral spring 13 until the stones 30 will pass into the cylinder to betreated. It is obvlous that the stones may also be drawn inwardly by a relative movement of the shaft 10 and head 11 by grasping these two parts and rotating them while the detent 23 is held disengaged from the notches 24: of the notched wheel 20. While the detent is held disengaged from the notches 24, the spiral spring 13 will serve to force the stones 30 out against the cylinder wall and in contact with the surface to be treated. The spiral spring 13 will force the stones 30 against the cylinder wall and upon rotation of the device the wall will be ground and trued up as desired. If the detent 23 does not engage with one of the notches 24, the grinding will continue until the desired diameter is reached or until the detent falls into engagement with one of the notches 24 when the stones have expanded snlliciently. If it is desired to have the detent 23 engaged with one of the notches and still permit of expansion of the stones under operative condition. the form of link shown in Fig. 8 may be used, where, it will be seen, the outer ends of the links 65 are provided with elongated holes 66. lVhen the tool starts to operate, the links in the modified form will be in the position shown in Fig. 8. As the cutting of the stones procceds, the screws 39 will move to the end of the elongated holes 66, and further expansion of the stones thus prevented.

Obviously, some modification of the details herein shown and described may be made without departing from the spirit of my invention, or the scope of the appended claims, and I do not, therefore, wish to be limited to the exact embodiment herein contained.

Having thus described my invention what I claim is:

1. A grinding tool comprising a shaft, a plurality of abrasive stones arranged symmetrically about the shaft, resilient means for yieldably forcing the stones outwardly, and rack and pinion means for moving the stones so that a tangential line drawn through the curved working surface of each stone will always be at right angles with a radial line drawn through the center of the shaft.

2. A grinding tool' comprising a shaft, a

plurality of abrasive stones arranged symmetrically about the shaft, resilient means for yieldably forcing the stones outwardly, a stop for preventing further expansion of the tool when the desired diameter is reached, and rack and pinion means for moving the stones so that a tangential line drawn through the curved working surface of each stone will always be at right angles with a radial line drawn through the center of the shaft.

. 3. A grinding tool comprising a shaft, a head rotatably carried by the shaft, spring means for producing a rotative tension between the shaft and the head, a plurality of stone trays arranged about the shaft, an abrasive stone carried by each of the trays, a link connecting one end of each of the trays with the head, means for supporting the other end of each of the trays, and rack and pinion means for moving the stones so that a tangential line drawn through the curved working surface of each stone will always be at right angles with a radial line drawn through the center of the shaft.

' of the trays and disposed about the shaft, a

mamas 4. grinding tool comprising a shaft, a head rotatably carried by the shaft, spring means for producing a rotative tension bea tween the shaft and the head, a plurality of stone trays arranged about the shaft, radially disposed bearing yokes carried by each of the trays and disposed about the shaft, a lirikconnecting one end of each of the tra s with the head, means for supporting t e other end of each of the trays, and means'for moving the okes in a radial direction from the center 0 the shaft.

5. A grinding tool comprising a shaft, a head rotatably carried by the shaft, spring means for producing a rotative tension between the shaft and the head, a plurality of stone trays arranged about the'shaft, radially disposed bearing yokes carried by each link connecting one end of each of the tra s with the head, means for supporting t e other end of each of the trays, an adjusting arifi carried by each of the trays and disposed about the shaft, a rack carried by each adjusting arm and engageable with gear teeth formed on the shaft, and means for moving the yokes in a radial direction from the center of the shaft.

6. In a cylinder grinding tool, the combination with a centrally arranged shaft, of

a plurality ofstone trays, bearing yokes for ing block rotatably mounted upon' the shaft, means connecting the trays with the shaft for driving the same, and means for adjusting the position of the trays.

7. In a cylinder grinding tool, the combination with a centrally arranged shaft, of

and means for connecting the adjusting yokewith the shaft.

In testimony whereof, I have hereunto signed my name,

' WALTER v. HOUCK.

'each tray, each yoke being disposed about the shaft and in bearing contact with a bear- 

